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estuary
noun
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How to pronounce estuary:

Definition of estuary:

estuary (noun):
an arm of the sea at the lower end of a river
a water passage where the tide meets a river current
the widening channel of a river where it nears the sea
the wide part of a river where it nears the sea; fresh and salt water mix.

Synonyms for estuary:

moutharmfjordwaterbayportcreekbayoucoveriver
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Antonyms for estuary:

source

Other 4-syllable words like estuary

Here are some other common words that have 4 syllables, like estuary does.

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